Improvement in stove-pipe flues



H. C. .IUHNSUN.

Stove-Pipe Flues. N0.153,082; PateritedJuIyI4J874.

/ WITNESSES/d jg w BY 6, 2 w I ATTORNEYS THE GRAFPUC C0. PHOTU'LITN-SQX'rl PARK PLACE, NY.

UNITED STATES PATENT QFFICE.

HENRY CORNELIUS JOHNSON, OF DALLAS CITY, ILLINOIS.

IMPROVEMENT lN STOVE-PIPE FLUES.

Specification forming part of Letters Patent No. 153,082, dated July 14,1874; application filed June 6, 1874.

To all whom it may concern:

Be it known that I, HENRY G. J oHNsoN, of Dallas City, in the county ofHancock and State of Illinois, have invented a new and valuableImprovement in Flues; and I do hereby declare that the following is afull, clear, and exact description of the construction and operation ofthe same, reference being had to the annexed drawings, making a part ofthis specification, and to the letters and figures of reference markedthereon.

Figure 1 of the drawing is a representation of a sectional view of mydevice; and Fig. 2 is a detail View. Fig. 3 is an end view.

This invention has relation to flue-pipes for stoves, and other likeheating devices, whenever it is desired to arrest the escape of theproducts of combustion without materially retarding the draft.

The improvement which I have invented consists in the application,within a stove-pipe or other fine leading from a fire-chamber, of acoiled blade which is provided with a U shaped spring for keeping itsperipheral edges in close contact with the interior surface of the pipeor flue, which blade will direct the heated currents toward the centerof the pipe or flue, and give to them a rotatory motion, thereby preventing much radiation of heat from the pipe or flue without materiallyinterfering with the natural draft, as will be hereinafter more fullydescribed.

In the annexed drawings, A designates a stove-pipe of cylindrical form,into which is inserted a'spiral blade or deflecting strip, B,

of which the flanges extend inwardly a certain distance from theinterior surfaces of the pipe A. (J designates a U-shaped metallicspring, the free extremities of which are inserted longitudinallythrough the hollow of the blade B, and which is rigidly secured theretoby means of rivet a.

To use and apply my improvement, I insert it into that section of pipewhich is passed from a room into a chimney-flue through a perforationmade for that purpose, when the spring 0 will cause the said blade to beforcibly held against the interior surfaces of the above-mentionedsection of pipe, and if now it be connected with the main inner pipe ofa stove in which a fire is then kindled, the heated products ofcombustion will be guided away from the pipe, and thus it will not begreatly heated, whereby all danger of fire being communicated to thehouse is obviated, while at the same time the said blade will notappreciably obstruct the natural draft of the stove.

Heretofore it has been usual to surround and attach the coiled blades toa central rod; but my improvement consists in applying the blades to anexpanding spring, whereby their peripheral edges are kept in contactwith the flue.

What I claim as new, and desire to secure by Letters Patent, is-

The combination, with the coiled blade B, of the'U-shaped spring G, forkeeping the peripheral edges of the blade B in close contact with theinterior surface of the flue, substantially as shown and described.

In testimony that I claim the above I have hereunto subscribed my namein the presence of two witnesses.

HENRY CORNELIUS JOHNSON.

Witnesses:

BALTUS H.-ProKELL, JOHN G. DoUcHERTY.

